Possible causes

– Faulty Fuel Temperature Sensor
– Fuel Temperature Sensor harness is open or shorted
– Fuel Temperature Sensor circuit poor electrical connection

Tech notes

Replaced Fuel Temperature Sensor

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0188 Description

The fuel tank temperature sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

P0188 Information for specific makes

P0188 VOLKSWAGEN
P0188 FORD